TOPEKA, Kan. (AP) -- The chief sponsor of a bill that could imprison federal officials for enforcing federal gun restrictions in Kansas says an assistant attorney general's criticism of the measure is off-base.

The Lawrence Journal-World (http://bit.ly/YrObOG) reports Assistant Attorney General Charles Klebe asserted the Supremacy Clause of the U.S. Constitution can't be waived by state law.

He also says a provision in the measure prohibiting doctors other than psychiatrists from asking about gun ownership could face First Amendment challenges.